Please identify the password verification function that is NOT vulnerable to timing attacks.$$

Question $10$ options:

def string$\_$compare$\_2($s$1,$s$2)$: if len$($s$1)!=$ len$($s$2)$: return False flag $=$ True for i in range$($len$($s$1))$: if s$1[$i$]!=$ s$2[$i$]$: flag $=$ False return flag def check$\_$password$\_2($password$)$: hardcoded$\_$password $=$ "xyzabchijk" if string$\_$compare$\_2($password$,$ hardcoded$\_$password$)$: return True else: return False

def string$\_$compare$\_1($s$1,$s$2)$: if len$($s$1)!=$ len$($s$2)$: return False for i in range$($len$($s$1))$: if s$1[$i$]!=$ s$2[$i$]$: return False return True def check$\_$password$\_1($password$)$: hardcoded$\_$password $=$ "xyzabchijk" if string$\_$compare$\_1($password$,$ hardcoded$\_$password$)$: return True else: return False